Improvement in steam-boilers



NTTe STATES PATENT @Tricia R; s. nanars, or DUBUQUE, IOWA.

Specification forming part of Letters Patent No. 40,929, dated December 15, 1863.

To all whom it may concern,.-

Beit known that I, R. S. HARRIS, of Dubuque, in the county ofDubuque and State ot" Iowa, have invented a new and useful Improvement in SteanrBoilers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a central longitudinal vertical section of a boiler constructed according to my invention. Fig. 2 is a transverse vertical section ofthe same.

Similar letters of reference indicate corresponding parts in both gures.

This invention consists in a novel arrangement of tubes, fines, and water-jacket, in con` nection with the cylindrical body or main porv tion of the boiler and with an upper water and steam drum, whereby I obtain a boiler which is very safe, durable, and economical of fuel.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A is the shell or main body of the boiler, of horizontal cylindrical form, and tilled from top to bottom as closely as desirable with horizontal tubes a a, which extend right through it.

B is the water-jacket, having the furnace C arranged in the front part ofit below the shell A, and surrounding theshell in rear of the fire-box in such manner as to form an annular due, D, from the furnace to the rear end of the shell. A sufficient space, b, islett between the rear end of the shell A and the rear end of the jacket for the gaseous products of combustion to pass from the annular iiue D into the tubes a al. At the front end ofthe boiler a breeching, E, covers the ends ot' the shell and tubes, and brings all the tubes into communication with the chimney I.

F is the drum, the lower part of which is to contain water and the upper part steam, arranged above the shell and wa-tervjacket in the position commonly occupied by the steamdrum and connected with the shell at c and with the water-jacket at d.

G is the steam-pipe.

H is a man-hole for reaching the interior of the shell, extending right across the space b,

and through the water-jacket and having the lid outside ofthe jacket.

The tiame and gaseous products of combustion from the furnace circulate along and entirely around the shell A, over its top as well as along its sides and underits bottom, thence through the space b and lues a a, to the breeching E and chimney, and, as the wateris so divided by the iiues as to bring every portion of it except that in the drum F into intimate contact with the heating-surface, the heat is utilized in a very high degree andthe generation of steam is effected with a very small consumption ot' fuel. By allowing the water to enter the drum and so allowing the whole of the shell and jacket to be filled with water, the necessity for the brick-work in the upper part of the annular tlue described in my Letters Patentoil July 21, 1863, is obviated, and I am enabled to use the whole outer surface of' the shell A and the whole inner surface of the jacket B as heating-surface withoutany danger ofinjuring any part ofthe boiler by overheating.

The water isgaged in the drum F.

What I claim as my invention, and desire to secureby Letters Patent, is

The boiler composed ofthe shell A, lled to the top with tubes am., the water-jacket B, the annular flue D, extending uninterruptedly round the shell and the drum F, containing both steam and water and com munie-ating with the shell and the jacket, which are both tlle'd with water, the whole combined substantially as herein set forth.

Rr. S. HARRIS.

Witnesses: E. LANGWORTHY, A. W. FLEMTNG. 

